One embodiment of the present invention provides a system that uses versioned pointers to facilitate reusing memory without having to reclaim the objects solely through garbage collection. The rear-view camera system includes a first camera positioned on a rear side of the vehicle. The elongated first body portion also includes a second end that is coupled to a first drying portion, which has a second width that is greater than the first width of the elongated first body portion. The drum is rotated to enable cleaning of filter media. The balloon is fully inflated when the endoscope that is used to place the tube in the duodenum is withdrawn, and then partially deflated to a size that allows peristaltic action on the balloon to move the tube into the jejunum, after which the balloon is further deflated to avoid creating an obstruction in the intestine.